Diagrama de sequência
	http://www.websequencediagrams.com/
Diagrama ER
	http://thewebmind.org/
MindMap
	http://www.mindmeister.com/
Class Diagram
	http://creately.com
Many different charts
	http://www.lucidchart.com/
	
	
	
-- to read and use as reference:
Botton-up parse or shift-reduce parsing
http://en.wikipedia.org/wiki/Shift-reduce_parsing
